I been having a CTS problem whenever I get any where near Pale Imperial Camp (mainly if the Dragon takes any damage at all) and Nilheim. NO error comes up, just stright to desktop. I've tried with mods and without mods that change textures.

yeah, you need to learn a bit about modding first before you go dabbling with them...better check out the pinned thread on modding my friend..

The mod embeds itself into your savegame, so If you remove the mod, and try to carry on with that save, it is going to bring up errors..best to use an earlier save before the mod was installed, or start over again, OR put the mod back, reinstall it, then the errors should be rectified...

Have a good look at some of the tutorials on modding too, just so you get to know what it's all about :)

I've been using the same mods for almost 200 hours spread out over more than a year. Its the first time of me going to those areas.So is my only choice is to start a new game? Where can I find out what caused the crash?

I did some google searches on those Locations and I found that the Pale camp there was a known issue with the nearby dragon mound. It caused crashes with or without mods, but the links are over a year old and they don't say if a fix was ever found.

There has been an official patch out since then, there are unofficial game patches that contain lots of fixes on the nexus...just have a look at the nexus for Skyrim unofficial patches. Also, if you care to look, that link I gave you has a ton of information you will benefit from absorbing...there may or may not be ( I think there will be) solutions for you in there..Have a look...

Patches usually fix glitches/bugs....check them out

There's an article on the HD pack too..some important info..well, it's up to you now to do the research